Most viruses come from un-safe downloading. A virus is generally in an .exe file extension. Most people freely download programs without knowing if they are safe or not. There are many ways to keep your downloads safe. An anti-virus program will sometimes block an un-safe download, but not always, so how can you be sure. Checking to make sure your files are safe is critical to your computers health. The steps below will help make sure you downloads are safe and secure.Contents -Checking the address of the webpage. -Saving the file not running. -Scanning the file(s).